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Abstract
In this paper, a single-phase reactive power compensation control for static compensator (STATCOM) is developed. The primary novelty lies in that the reactive power compensation of STATCOM is reformulated as an equivalent tracking control for the reactive current, and a novel unknown system dynamics estimator (USDE) is also investigated to address the unknown system dynamics. A modeling phase based on a basic structure of single-phase STATCOM and the principle of STATCOM is first carried out to describe its behavior. To address the unknown dynamics and external disturbances, a new USDE is then developed, so that the modeling uncertainties and external disturbances can be accommodated without using a function approximator, where the demanding computational costs and tedious parameter tuning in the other control schemes are remedied. Finally, based on the proposed estimator, we design a composite control with a proportional integral (PI) feedback controller and the proposed estimator to achieve precise current tracking. The convergence analysis of both the estimation error and the control error is also given. Simulation results using a realistic simulator are presented to show the efficiency of the suggested strategy.
Highlights
To improve the power quality in the power systems, it is necessary to provide users with pollution-free power and make the voltage stable
The low-voltage single-phase inductive loads are widely used in the modern power systems, such as electric vehicle charging pile and electric locomotive, etc., which will in turn increase the loss of reactive power in the power systems [4]. erefore, it is important to study the single-phase dynamic reactive power compensation to improve the stability of power systems [5]
The profiles of the estimated dynamics with the unknown system dynamics estimator (USDE) and the SMO are given in Figure 10, which indicate that better estimation performance can be achieved by using USDE than that of SMO
Summary
To improve the power quality in the power systems, it is necessary to provide users with pollution-free power and make the voltage stable. The aforementioned observers require designing an observer, and they impose many parameters to be tuned, which may not be an easy task for practitioners In this respect, it is worth to further investigate a new estimator with less tuning parameters and guaranteed convergence to address the unknown system nonlinearities for STATCOM control systems. Based on the above discussion, this paper will develop a novel reactive power compensation method for STATCOM with fully unknown nonlinear dynamics and external disturbances. A new constructive unknown system dynamic estimator (USDE) is developed to address the unknown disturbances and model uncertainties, so that the function approximator is not needed, and the demanding computational costs and tedious parameter tuning are remedied.
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